An Energy Performance Certificate (EPC) rates how energy-efficient a building is, on a scale from A (most efficient) to G (least efficient). Every property sold, let, or newly built in the UK is legally required to have one.
EPC stands for Energy Performance Certificate. It's a standardised document that scores a property's energy efficiency out of 100 and translates that score into a letter band, similar to the energy labels you see on fridges or washing machines.
Each band covers a range of the 1–100 efficiency score: A (92–100) and B (81–91) are the most efficient — usually new-build homes with modern insulation and heating. C (69–80) and D (55–68) sit in the middle, which is where most existing UK housing stock falls. E (39–54), F (21–38) and G (1–20) are the least efficient, typically older properties with poor insulation and outdated heating systems.
Every EPC shows two numbers: your current rating, based on the property as it stands, and a potential rating, showing what band the property could reach with recommended improvements (better insulation, a more efficient boiler, and so on).
Want to check a specific property's rating right now?
Go to the EPC checker →Energy Performance Certificate.
It's a letter grade (A–G) showing how energy-efficient a building is, based on its insulation, heating system, and construction.